Thermodynamics of Silicon Nitride. Standard molar enthalpy of formation of amorphous Si3N4 at 298.15 K |
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Authors: | Tomaszkiewicz I |
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Institution: | (1) Institute of Physical Chemistry of the Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland |
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Abstract: | The standard molar enthalpy of formation Δf
H
m
0=–760±12 kJ for amorphous silicon nitride a-Si3N4 has been determined from fluorine combustion calorimetry measurements of the massic energy of the reaction: a-Si3N4(s)+6F2(g)=3SiF4(g)+2N2(g). This value combined with Δf
H
m
0= –828.9±3.4 kJ for a-Si3N4 indicates that determined for the first time molar enthalpy change for the transition from amorphous to α-crystalline form
Δtrs
H
m
0=69±13 kJ is very evident, in spite of its large uncertainty range resulting from impurity corrections.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | fluorine bomb calorimetry silicone nitride standard enthalpy of formation |
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